Breaking News: Grepper is joining You.com. Read the official announcement!

Delete and backspace in rust

Rustacean answered on March 17, 2023 Popularity 1/10 Helpfulness 1/10

answer Delete and backspace in rust

Delete and backspace in rust

Comment

// let mut a = String::from("bpp--o+er+++sskroi-++lcw");
// delete_and_backspace(&mut a); == "borrow"
pub fn delete_and_backspace(input: &mut String) {

    // string to store result
    let mut result: String = String::new();
    
    // loop over string and perform delete/backspace using a stack data structure
    let mut plus_count: i32 = 0;
    for ch in input.chars() {
        if ch == '-' && result.len() > 0 { // right operand because cannot truncate empty string for example "--++++"
            result.truncate(result.len()-1)
        } else if ch == '+' {
            // increment count if character is "+".
            plus_count += 1;
        } else {
            // skip characters according to number of pluses,
            if plus_count > 0 {
                plus_count -= 1;
                continue;
            }
            result.push(ch)
        }
    }

    // dereference and result to the string.
    *input = result

}



pub fn do_operations(expressions: &mut Vec<String>) {
    // loop through the array, split each element by + or - and then do the addition or subtraction.
    for expression in expressions.iter_mut() {
        // check for plus or minus sign
        if expression.contains("+") {
            let split: Vec<&str> = expression.split("+").collect();
            let sum = split[0].parse::<i32>().unwrap() + split[1].parse::<i32>().unwrap();
            *expression = sum.to_string()
        } else if expression.contains("-") {
            let split: Vec<&str> = expression.split("-").collect();
            let sum = split[0].parse::<i32>().unwrap() - split[1].parse::<i32>().unwrap();
            *expression = sum.to_string()
        }
    }
}

Popularity 1/10 Helpfulness 1/10 Language rust

Source: Grepper

Tags: backspace rust

Link to this answer
Share Copy Link

Contributed on Mar 17 2023

Rustacean

0 Answers Avg Quality 2/10

Delete and backspace in rust

Contents

More Related Answers

Delete and backspace in rust

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.